/*自定义后台样式框架*/
.mainCotent{
    box-sizing:border-box;
    padding:20px;
    background:#fff;
    min-height:1800px;
}
.redFont{
    color:red !important;
}

.mainCotent .carddiv{
 margin-bottom:20px;
}

/*课程*/
.mainCotent .tip{
    text-align:left;
    color:#ff3535;
}